JPH05264997A - Production of liquid crystal electrooptical device - Google Patents

Abstract

PURPOSE:To prevent the flaws, orientation lines and electrostatic breakdown generated at the time of a rubbing treatment and to obtain the liquid crystal electrooptical device having excellent display quality. CONSTITUTION:This display device is constituted by forming a driving electrode film and an oriented film on a substrate 1b surface and subjecting the surface thereof to a rubbing treatment, then disposing two sheets of the substrates opposite to each other and filling and sealing a liquid crystal into the spacing part therebetween. The process for production of the liquid crystal electrooptical device consists in executing the rubbing treatment while bringing a grounded metallic plate 1d into contact with the surface of a rubbing roll 1a and by providing a juncture 1e consisting of a conductive material on the substrate 1b from the metallic plate 1d.

Description

Detailed Description of the Invention

[0001]

This invention relates to a computer terminal,
The present invention relates to a method for manufacturing a liquid crystal electro-optical device used in a system such as an image display device and a shutter.

[0002]

2. Description of the Related Art As a dot matrix type display device, a liquid crystal electro-optical device, which is thin, lightweight and low in power consumption, has been drawing attention. In a liquid crystal electro-optical device, a drive electrode pattern and an alignment film on the drive electrode pattern are formed on the surface, and two rubbing-processed substrates as shown in FIG. It is configured by enclosing.

[0003]

However, in the conventional manufacturing method, when rubbing the alignment film, the rubbing cloth is damaged by the corners of the substrate or the projections deposited on the surface of the substrate, and the rubbing cloth is partially damaged. If scratches or alignment stripes are generated or static electricity generated during rubbing causes a part of the alignment film to be electrostatically destroyed, scratches, stripes, or misalignment can be seen as a liquid crystal electro-optical device, and good display image quality can be obtained. There was a problem that I could not do it.

[0004]

In order to solve the above problems, the present invention relates to a method for manufacturing a liquid crystal electro-optical device, as shown in FIG. 1, grounding a surface of a rubbing roll at a constant contact length during rubbing treatment of an alignment film. Rubbing treatment is performed by contacting the formed metal plate and by providing a connecting portion made of a conductive material from the metal plate to the substrate electrode, and then a projection formed on the corner of the substrate or on the substrate surface during the rubbing treatment. The rubbing cloth damaged by was regenerated every time the rubbing roll was rotated, and the surface of the rubbing roll and the surface of the substrate were kept at the same potential to prevent the influence of static electricity generated during rubbing.

[0005]

In the liquid crystal electro-optical device manufactured by the rubbing method as described above, it is possible to prevent scratches and alignment stripes caused by damage to the rubbing cloth during the rubbing process.
In addition, it is possible to prevent electrostatic damage to the alignment film due to static electricity, and to obtain a good image quality without scratches, streaks, or defective alignment as a liquid crystal electro-optical device.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a rubbing method of the present invention.
1a is a rubbing roll, 1b is a substrate, 1c is a table,
Reference numeral 1d is a metal plate for recycling a damaged rubbing cloth in the present invention, and reference numeral 1e is a conductive connecting portion for keeping the surface of the rubbing roll and the surface of the substrate at the same potential.

Using the rubbing method as described above, a substrate having a drive electrode pattern and an alignment film formed on the drive electrode pattern on the surface is subjected to a rubbing treatment so that liquid crystal molecules are aligned at 240 degrees, and a substrate gap is 6 μm. Number of display pixels 640
An STN liquid crystal electro-optical device having × 400 and 1/200 duty was manufactured. (Comparative Example 1) In order to make the surface of the rubbing roll and the surface of the substrate the same potential, a substrate having an electrode pattern in which all drive electrodes are short-circuited as shown in FIG. Was produced. A substrate having a similar drive electrode pattern was manufactured by a conventional method.
The results are shown in FIGS. FIG. 5 shows a liquid crystal electro-optical device manufactured by the method of the present invention, and FIG. 6 shows a display state when a voltage is applied to the liquid crystal electro-optical device manufactured by the conventional method. 6 shows scratches, alignment streaks, and alignment defects due to electrostatic breakdown of the alignment film, which are generated during rubbing treatment, but FIG. 5 shows good display image quality without scratches, alignment streaks, and alignment defects due to electrostatic breakdown. was gotten.

(Comparative Example 2) A liquid crystal electro-optical device was prepared by using a rubbing method of the present invention in which a substrate having a drive electrode pattern not short-circuited was provided with a conductive mask as shown in FIG. Was produced. Similarly, a conductive mask was placed on the substrate, and a liquid crystal electro-optical device was manufactured using a conventional method. As a result, similar to Comparative Example 1, the liquid crystal electro-optical device using the method of the present invention was free from scratches, alignment streaks and alignment defects due to electrostatic breakdown, and was able to obtain a good display image quality.

[0009]

As described above, according to the present invention, in the method for manufacturing a liquid crystal electro-optical device, the rubbing roll surface is contacted with a metal plate grounded at a constant contact length during the rubbing treatment of the alignment film, and Rubbing the rubbing cloth damaged by the corners of the substrate or the protrusions deposited on the substrate surface when the rubbing process is performed by providing a connection part made of a conductive material from the metal plate to the substrate electrode. It can be regenerated each time the roll rotates. In addition, by keeping the surface of the rubbing roll and the surface of the substrate at the same potential, the influence of static electricity generated during rubbing can be prevented, scratches and alignment stripes that occur due to damage to the rubbing cloth during rubbing processing can be prevented, and static electricity of the alignment film caused by static electricity can be prevented. It is possible to obtain a liquid crystal electro-optical device having an excellent display quality which is free from scratches, streaks and alignment defects as a liquid crystal electro-optical device by preventing electric breakdown.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a rubbing method of the present invention.

FIG. 2 is an explanatory diagram showing a conventional rubbing method.

FIG. 3 is an explanatory diagram showing a drive electrode pattern of a substrate used in an experiment of the present invention.

FIG. 4 is an explanatory diagram of a case where a conductive mask is placed on the substrate used in the experiment of the present invention.

FIG. 5 is an explanatory diagram showing a display state when a voltage is applied to a liquid crystal electro-optical device manufactured by using the rubbing method of the present invention.

FIG. 6 is an explanatory diagram showing a display state when a voltage is applied to a liquid crystal electro-optical device manufactured by using a conventional rubbing method.

[Explanation of symbols]

1a, 2a Rubbing roll 1b, 2b Substrate having drive electrode pattern on the surface and alignment film on the drive electrode pattern 1c, 2c Table 1d Metal plate 1e of the present invention 1e Conductive connection part 5a, 6a Liquid crystal electro-optic of the present invention Device frame 5b, 6b Display pattern of A in negative mode 6c Alignment stripes generated during rubbing treatment 6d Alignment failure due to electrostatic breakdown of alignment film generated during rubbing treatment

Claims (1)

[Claims] 1. A step of forming a drive electrode pattern on a surface of a substrate, an alignment film on the drive electrode pattern, and a step of rubbing the substrate with a rubbing roll,
Preparing two substrates that have been subjected to the rubbing treatment, and using the alignment film as an inner surface, and providing a gap to bond the substrates;
In the method of manufacturing a liquid crystal electro-optical device, including a step of enclosing a liquid crystal in the gap, the step of performing the rubbing treatment, the surface of the rubbing roll, a grounded metal plate in contact with a constant length, and A method of manufacturing a liquid crystal electro-optical device, which comprises a step of electrically treating the electrode pattern and the metal plate by a tangential line through a connecting portion made of a conductive material.